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Radiant|Natural|GIA

1.30ct K SI1 Radiant Natural Diamond

ID • K/SI1 • GIA 4

Certificate GIA 4

Diamond specifications and retailer prices

From $5,046 AUD
As of November 4, 2026
Save $1,269 AUD (20%) vs most expensive(unlock to see where)
3 retailers carry this diamond
Most expensive: $6,315 AUD at Blue Nile · As of November 5, 2026
View at Blue Nile

About this 1.3ct natural radiant diamond

This 1.3ct natural radiant sits in the one-and-a-quarter to one-and-a-half carat band, graded K colour (faint-tinted) and SI1 clarity (slightly-included), with a top-tier cut grade stated by the retailer rather than the lab and certified by GIA. Listed at 3 retailers as of November 4, 2026, with prices from $5,046 to $6,315, a $1,269 spread on the same certified stone. Blue Nile lists it at $6,315. SI-grade stones are eye-clean roughly 60 to 70% of the time at this carat range. Check the inclusion plot on the cert and ask the retailer for high-resolution video before buying.

The 4Cs

1.30
Carat
K
Colour
SI1
Clarity
Ideal
Cut (retailer stated)

Specifications

Cut (retailer stated)Ideal
PolishVery Good
SymmetryVery Good
FluorescenceNone
OriginNatural
Grading LabGIA
CertificateGIA 4
Dimensions7.07 × 5.85 × 3.79 mm
L/W Ratio1.21
Top View
7.07 mm5.85 mm1.30 ctK / SI1
OriginNatural
CutIdeal
PolishVery Good
SymmetryVery Good
FluorescenceNone
CertificateGIA 4
Side View
Table 70.0%CrownGirdle: MED-ETKPavilionCulet: NoneDepth 64.8%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 4
Current: $6,315 AUD|Low: $5,046 AUD|High: $6,315 AUD|Avg: $5,300 AUD
Blue Nile
Retailer 2
Retailer 3
September 26, 2026
Retailer 3$5,046 AUD
Retailer 2$5,047 AUD
Blue Nile$6,315 AUD

2 data points across 3 retailers

3 retailers$5,046 AUD to $6,315 AUD

B+
Cheapest Retailer
-
$5,046 AUD
B+
Retailer 2
-
$5,047 AUD
View
Most Expensive
B
Blue Nile
5631297 · Nov 5
$6,315 AUD
$4,339 USD
View
2 more retailers have this diamond
Prices start from $5,046 AUDSave up to $1,269 AUD

Carat Hunter is not affiliated with, endorsed by, or sponsored by any retailer listed. Retailer information is from publicly available sources and may not be current. Verify details directly with the retailer before purchasing. Return terms as we hold them. Check the retailer's own returns page before you buy.

B+
1.30ct Radiant
$5,046 AUD